Answer / kapil

The regulation of transformer is same as it's percentage
impedance. this means the secondary voltage will drop @ 5%
for a transformer having 5% impedance. to compensate this
internal voltge drop we select nominal tap setting to 433
v. if you keep nominal tap for 415 V, we can not properly
utilize tapping range as 5% is internal drop at full load.

Answer / sriman

The voltage variation between secondary terminals and load
end voltage is because of voltage drop existing between to
systems

Answer / a.k.sen

To compensate the V-drop in the Transformer (considering Impedence value)at full load, Secondary voltage at 433V is selected for load terminal voltage at 415V.

Answer / vishvesh

this difference is kept between transformer secondary and
load terminal because. considering line losses (losses
occurs in the transmission line from transformer secondary
to load).there must be some voltage drop in the
transmission line and also c.t.and p.t. connected across
the line for protection relays also consumes some kind of
voltage from the line.

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